function hello(){
echo 'hello, world!'
}
function tell_who_i_am(){
whoami
}
function which_distro_do_i_use(){
grep ^NAME /etc/os-release
}
function view_my_cpu_arch(){
uname -m
}
function show_first_scsi_disk_size() {
lsblk -l | \grep disk | \grep '^sda ' |awk '{print $4}'
}
function show_main_memory_size_in_megabytes() {
free -m |grep "Mem:" |awk '{print $2}'
}
